Calculation of electricity consumption from heating demand

your heat demand is certainly not 10 kW. Your car also does not consume 60 hp per 100 km!

Perhaps you mean the heating load of your building with 10 kW. Whether this is realistic for a new building depends on the size and energy standard of your building. The heating load of a new building is usually determined during the building application process and energy demand calculation according to the Energy Saving Ordinance. The heating load of 10 kW indicates that your building can achieve an indoor temperature of 20°C at an outdoor temperature of -10°C to -16°C (depending on the region) with 10 kW of heating capacity (including allowances for heating up). Realistic values in the new building sector are probably 35-50 W/m².

From the heating load, as already mentioned, you can roughly infer the required amount of heat and from that, with known system technology, roughly the required amount of electricity, however with great uncertainty!

More precise information can be found in your heat demand calculation.

Sounds like a lecture that heat demand is not specified in kW? Am I understanding that correctly? But it is stated that way everywhere => Living area [m²] × specific heat demand [kW/m²] = building heat demand [kW] But I'm happy to be taught. After all, I'm not an engineer.

The correct word would be building heating load, which is given in watts.. But I think everyone knows what you meant.

The heat demand is always given in kWh/m², not in kW/m².
The heating load for a building is given in kW, generally without reference to the area.

Both should not be confused, as this only leads to confusion. Perhaps a lesson, but I hope it is taken as constructive advice and not as disparaging.

kW = kilowatt = 1000 W is a power
kWh = kilowatt-hour = 1000 W for one hour is an amount of heat.

From the heat demand, you can quite quickly derive the electricity demand via the annual performance factor; from the building heating load, this is at least one more step and significantly less accurate.

Ok, thanks for the hint (of course, I take this as constructive criticism). But quite a few sites get it wrong.
When I Google the words "heat demand" or "heat demand calculation" and look at the sites and example calculators, I keep coming across the figures in kW (e.g., kesselheld).
In the energy performance certificate, however, the figure is given in kWh/(m²*a).

On the internet, I find for example the information:
"New building according to energy saving ordinance: 0.04 kW/m²"

Multiplying this by our living area of 152 sqm results in an approximate heating load(!) of 6.08 kW. My question here would be whether I now multiply this by 1,800 hours to get the heat demand? This would then be 10,944 kWh. Or is it calculated differently?

That's true, but as I said, always just roughly.